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Old 12-12-07, 10:11 PM   #1
stringbreaker
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rear dropout dimensions

I have a frame with 120mm rear dropout dimension inside to inside. I want to use quick release Hubs with this bike and need new axles my question is I see them available for 126mm rear dropouts. Now I know I can spread the frame enough to get the 126mm but will this affect the performance of the locking capability of the quick release skewers? Am I concerned for no reason or is it a valid concern?
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Old 12-12-07, 10:55 PM   #2
Sheldon Brown
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Quote:
Originally Posted by stringbreaker View Post
I have a frame with 120mm rear dropout dimension inside to inside. I want to use quick release Hubs with this bike and need new axles my question is I see them available for 126mm rear dropouts. Now I know I can spread the frame enough to get the 126mm but will this affect the performance of the locking capability of the quick release skewers? Am I concerned for no reason or is it a valid concern?
QR axles are normally 11 mm longer than the spacing they're designed for (though you can get by with MUCH less.)

If you use a 137 mm QR axle with 120 mm spacing, the ends of the axle will stick out too far, and the QR won't work.

If you add washers to build up the hub's spacing to 126 it should work.

Another option is to cut the axle down. If you go this route, better to start with a longer axle, that way you have a longer bit to grab in the vise when you're sawing it off. Longer axles don't generally cost any more.

However, make sure your skewers are compatible if you go this route. Most newer skewers aren't threaded in far enough to work with 120 mm spacing...you may not be able to screw the acorn nut on far enough to work, especially if your frame has thin stamped dropouts, as many older frames do.

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